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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: Op.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse.expr;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.lang.reflect.Array;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.util.List;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.Map;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>import org.jsimpledb.parse.ParseSession;<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span>/**<a name="line.16"></a>
<span class="sourceLineNo">017</span> * Java expression operators.<a name="line.17"></a>
<span class="sourceLineNo">018</span> */<a name="line.18"></a>
<span class="sourceLineNo">019</span>public enum Op {<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>// NOTE: operations without overridden apply() methods are handled in the corresponding parser class<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>// Array access<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    ARRAY_ACCESS(2, "[]") {<a name="line.25"></a>
<span class="sourceLineNo">026</span>        @Override<a name="line.26"></a>
<span class="sourceLineNo">027</span>        @SuppressWarnings({ "unchecked", "rawtypes" })<a name="line.27"></a>
<span class="sourceLineNo">028</span>        Value apply(ParseSession session, final Value targetValue, final Value itemValue) {<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>            // Check null<a name="line.30"></a>
<span class="sourceLineNo">031</span>            final Object target = targetValue.checkNotNull(session, "array access");<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>            // Handle map<a name="line.33"></a>
<span class="sourceLineNo">034</span>            if (target instanceof Map) {<a name="line.34"></a>
<span class="sourceLineNo">035</span>                final Map map = (Map)target;<a name="line.35"></a>
<span class="sourceLineNo">036</span>                final Object key = targetValue.get(session);<a name="line.36"></a>
<span class="sourceLineNo">037</span>                return new AbstractLValue() {<a name="line.37"></a>
<span class="sourceLineNo">038</span>                    @Override<a name="line.38"></a>
<span class="sourceLineNo">039</span>                    public Object get(ParseSession session) {<a name="line.39"></a>
<span class="sourceLineNo">040</span>                        return map.get(key);<a name="line.40"></a>
<span class="sourceLineNo">041</span>                    }<a name="line.41"></a>
<span class="sourceLineNo">042</span>                    @Override<a name="line.42"></a>
<span class="sourceLineNo">043</span>                    public void set(ParseSession session, Value value) {<a name="line.43"></a>
<span class="sourceLineNo">044</span>                        final Object obj = value.get(session);<a name="line.44"></a>
<span class="sourceLineNo">045</span>                        try {<a name="line.45"></a>
<span class="sourceLineNo">046</span>                            map.put(key, obj);<a name="line.46"></a>
<span class="sourceLineNo">047</span>                        } catch (RuntimeException e) {<a name="line.47"></a>
<span class="sourceLineNo">048</span>                            throw new EvalException("invalid map put operation"<a name="line.48"></a>
<span class="sourceLineNo">049</span>                              + (e.getMessage() != null ? ": " + e.getMessage() : ""), e);<a name="line.49"></a>
<span class="sourceLineNo">050</span>                        }<a name="line.50"></a>
<span class="sourceLineNo">051</span>                    }<a name="line.51"></a>
<span class="sourceLineNo">052</span>                };<a name="line.52"></a>
<span class="sourceLineNo">053</span>            }<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span>            // Handle list<a name="line.55"></a>
<span class="sourceLineNo">056</span>            if (target instanceof List) {<a name="line.56"></a>
<span class="sourceLineNo">057</span>                final List list = (List)target;<a name="line.57"></a>
<span class="sourceLineNo">058</span>                final int index = itemValue.checkIntegral(session, "list index");<a name="line.58"></a>
<span class="sourceLineNo">059</span>                return new AbstractLValue() {<a name="line.59"></a>
<span class="sourceLineNo">060</span>                    @Override<a name="line.60"></a>
<span class="sourceLineNo">061</span>                    public Object get(ParseSession session) {<a name="line.61"></a>
<span class="sourceLineNo">062</span>                        return list.get(index);<a name="line.62"></a>
<span class="sourceLineNo">063</span>                    }<a name="line.63"></a>
<span class="sourceLineNo">064</span>                    @Override<a name="line.64"></a>
<span class="sourceLineNo">065</span>                    public void set(ParseSession session, Value value) {<a name="line.65"></a>
<span class="sourceLineNo">066</span>                        final Object obj = value.get(session);<a name="line.66"></a>
<span class="sourceLineNo">067</span>                        try {<a name="line.67"></a>
<span class="sourceLineNo">068</span>                            list.set(index, obj);<a name="line.68"></a>
<span class="sourceLineNo">069</span>                        } catch (RuntimeException e) {<a name="line.69"></a>
<span class="sourceLineNo">070</span>                            throw new EvalException("invalid list set operation"<a name="line.70"></a>
<span class="sourceLineNo">071</span>                              + (e.getMessage() != null ? ": " + e.getMessage() : ""), e);<a name="line.71"></a>
<span class="sourceLineNo">072</span>                        }<a name="line.72"></a>
<span class="sourceLineNo">073</span>                    }<a name="line.73"></a>
<span class="sourceLineNo">074</span>                };<a name="line.74"></a>
<span class="sourceLineNo">075</span>            }<a name="line.75"></a>
<span class="sourceLineNo">076</span><a name="line.76"></a>
<span class="sourceLineNo">077</span>            // Assume it must be an array<a name="line.77"></a>
<span class="sourceLineNo">078</span>            final int index = itemValue.checkIntegral(session, "array index");<a name="line.78"></a>
<span class="sourceLineNo">079</span>            return new AbstractLValue() {<a name="line.79"></a>
<span class="sourceLineNo">080</span>                @Override<a name="line.80"></a>
<span class="sourceLineNo">081</span>                public Object get(ParseSession session) {<a name="line.81"></a>
<span class="sourceLineNo">082</span>                    try {<a name="line.82"></a>
<span class="sourceLineNo">083</span>                        return Array.get(target, index);<a name="line.83"></a>
<span class="sourceLineNo">084</span>                    } catch (IllegalArgumentException e) {<a name="line.84"></a>
<span class="sourceLineNo">085</span>                        throw new EvalException("invalid array access operation on non-array", e);<a name="line.85"></a>
<span class="sourceLineNo">086</span>                    } catch (ArrayIndexOutOfBoundsException e) {<a name="line.86"></a>
<span class="sourceLineNo">087</span>                        throw new EvalException("array index out of bounds"<a name="line.87"></a>
<span class="sourceLineNo">088</span>                          + (e.getMessage() != null ? ": " + e.getMessage() : ""), e);<a name="line.88"></a>
<span class="sourceLineNo">089</span>                    }<a name="line.89"></a>
<span class="sourceLineNo">090</span>                }<a name="line.90"></a>
<span class="sourceLineNo">091</span>                @Override<a name="line.91"></a>
<span class="sourceLineNo">092</span>                public void set(ParseSession session, Value value) {<a name="line.92"></a>
<span class="sourceLineNo">093</span>                    final Object obj = value.get(session);<a name="line.93"></a>
<span class="sourceLineNo">094</span>                    try {<a name="line.94"></a>
<span class="sourceLineNo">095</span>                        Array.set(target, index, obj);<a name="line.95"></a>
<span class="sourceLineNo">096</span>                    } catch (IllegalArgumentException e) {<a name="line.96"></a>
<span class="sourceLineNo">097</span>                        throw new EvalException("invalid array set operation"<a name="line.97"></a>
<span class="sourceLineNo">098</span>                          + (e.getMessage() != null ? ": " + e.getMessage() : ""), e);<a name="line.98"></a>
<span class="sourceLineNo">099</span>                    } catch (ArrayIndexOutOfBoundsException e) {<a name="line.99"></a>
<span class="sourceLineNo">100</span>                        throw new EvalException("array index out of bounds"<a name="line.100"></a>
<span class="sourceLineNo">101</span>                          + (e.getMessage() != null ? ": " + e.getMessage() : ""), e);<a name="line.101"></a>
<span class="sourceLineNo">102</span>                    }<a name="line.102"></a>
<span class="sourceLineNo">103</span>                }<a name="line.103"></a>
<span class="sourceLineNo">104</span>            };<a name="line.104"></a>
<span class="sourceLineNo">105</span>        }<a name="line.105"></a>
<span class="sourceLineNo">106</span>    },<a name="line.106"></a>
<span class="sourceLineNo">107</span><a name="line.107"></a>
<span class="sourceLineNo">108</span>// Member access<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>    MEMBER_ACCESS(2, "."),<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span>// Invoke method<a name="line.112"></a>
<span class="sourceLineNo">113</span><a name="line.113"></a>
<span class="sourceLineNo">114</span>    INVOKE_METHOD(2, "()"),<a name="line.114"></a>
<span class="sourceLineNo">115</span><a name="line.115"></a>
<span class="sourceLineNo">116</span>// Unary<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span>    POST_INCREMENT(1, "++"),<a name="line.118"></a>
<span class="sourceLineNo">119</span>    POST_DECREMENT(1, "--"),<a name="line.119"></a>
<span class="sourceLineNo">120</span>    PRE_INCREMENT(1, "++"),<a name="line.120"></a>
<span class="sourceLineNo">121</span>    PRE_DECREMENT(1, "--"),<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span>    UNARY_PLUS(1, "+") {<a name="line.123"></a>
<span class="sourceLineNo">124</span>        @Override<a name="line.124"></a>
<span class="sourceLineNo">125</span>        Value apply(ParseSession session, Value value) {<a name="line.125"></a>
<span class="sourceLineNo">126</span>            return new ConstValue(value.checkNumeric(session, "unary plus"));        // note: returned value is not an L-value<a name="line.126"></a>
<span class="sourceLineNo">127</span>        }<a name="line.127"></a>
<span class="sourceLineNo">128</span>    },<a name="line.128"></a>
<span class="sourceLineNo">129</span><a name="line.129"></a>
<span class="sourceLineNo">130</span>    UNARY_MINUS(1, "-") {<a name="line.130"></a>
<span class="sourceLineNo">131</span>        @Override<a name="line.131"></a>
<span class="sourceLineNo">132</span>        Value apply(ParseSession session, Value value) {<a name="line.132"></a>
<span class="sourceLineNo">133</span>            return value.negate(session);<a name="line.133"></a>
<span class="sourceLineNo">134</span>        }<a name="line.134"></a>
<span class="sourceLineNo">135</span>    },<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>
<span class="sourceLineNo">137</span>    LOGICAL_NOT(1, "!") {<a name="line.137"></a>
<span class="sourceLineNo">138</span>        @Override<a name="line.138"></a>
<span class="sourceLineNo">139</span>        Value apply(ParseSession session, Value value) {<a name="line.139"></a>
<span class="sourceLineNo">140</span>            return new ConstValue(!value.checkBoolean(session, "logical `not'"));<a name="line.140"></a>
<span class="sourceLineNo">141</span>        }<a name="line.141"></a>
<span class="sourceLineNo">142</span>    },<a name="line.142"></a>
<span class="sourceLineNo">143</span><a name="line.143"></a>
<span class="sourceLineNo">144</span>    INVERT(1, "~") {<a name="line.144"></a>
<span class="sourceLineNo">145</span>        @Override<a name="line.145"></a>
<span class="sourceLineNo">146</span>        Value apply(ParseSession session, Value value) {<a name="line.146"></a>
<span class="sourceLineNo">147</span>            return value.invert(session);<a name="line.147"></a>
<span class="sourceLineNo">148</span>        }<a name="line.148"></a>
<span class="sourceLineNo">149</span>    },<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span>// Cast<a name="line.151"></a>
<span class="sourceLineNo">152</span><a name="line.152"></a>
<span class="sourceLineNo">153</span>    CAST(1, "()") {<a name="line.153"></a>
<span class="sourceLineNo">154</span>        // Handled by CastExprParser<a name="line.154"></a>
<span class="sourceLineNo">155</span>    },<a name="line.155"></a>
<span class="sourceLineNo">156</span><a name="line.156"></a>
<span class="sourceLineNo">157</span>// Multiplicative<a name="line.157"></a>
<span class="sourceLineNo">158</span><a name="line.158"></a>
<span class="sourceLineNo">159</span>    MULTIPLY(2, "*") {<a name="line.159"></a>
<span class="sourceLineNo">160</span>        @Override<a name="line.160"></a>
<span class="sourceLineNo">161</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.161"></a>
<span class="sourceLineNo">162</span>            return lhs.multiply(session, rhs);<a name="line.162"></a>
<span class="sourceLineNo">163</span>        }<a name="line.163"></a>
<span class="sourceLineNo">164</span>    },<a name="line.164"></a>
<span class="sourceLineNo">165</span><a name="line.165"></a>
<span class="sourceLineNo">166</span>    DIVIDE(2, "/") {<a name="line.166"></a>
<span class="sourceLineNo">167</span>        @Override<a name="line.167"></a>
<span class="sourceLineNo">168</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.168"></a>
<span class="sourceLineNo">169</span>            return lhs.divide(session, rhs);<a name="line.169"></a>
<span class="sourceLineNo">170</span>        }<a name="line.170"></a>
<span class="sourceLineNo">171</span>    },<a name="line.171"></a>
<span class="sourceLineNo">172</span><a name="line.172"></a>
<span class="sourceLineNo">173</span>    MODULO(2, "%") {<a name="line.173"></a>
<span class="sourceLineNo">174</span>        @Override<a name="line.174"></a>
<span class="sourceLineNo">175</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.175"></a>
<span class="sourceLineNo">176</span>            return lhs.mod(session, rhs);<a name="line.176"></a>
<span class="sourceLineNo">177</span>        }<a name="line.177"></a>
<span class="sourceLineNo">178</span>    },<a name="line.178"></a>
<span class="sourceLineNo">179</span><a name="line.179"></a>
<span class="sourceLineNo">180</span>// Additive<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>
<span class="sourceLineNo">182</span>    PLUS(2, "+") {<a name="line.182"></a>
<span class="sourceLineNo">183</span>        @Override<a name="line.183"></a>
<span class="sourceLineNo">184</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.184"></a>
<span class="sourceLineNo">185</span>            return lhs.add(session, rhs);<a name="line.185"></a>
<span class="sourceLineNo">186</span>        }<a name="line.186"></a>
<span class="sourceLineNo">187</span>    },<a name="line.187"></a>
<span class="sourceLineNo">188</span><a name="line.188"></a>
<span class="sourceLineNo">189</span>    MINUS(2, "-") {<a name="line.189"></a>
<span class="sourceLineNo">190</span>        @Override<a name="line.190"></a>
<span class="sourceLineNo">191</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.191"></a>
<span class="sourceLineNo">192</span>            return lhs.subtract(session, rhs);<a name="line.192"></a>
<span class="sourceLineNo">193</span>        }<a name="line.193"></a>
<span class="sourceLineNo">194</span>    },<a name="line.194"></a>
<span class="sourceLineNo">195</span><a name="line.195"></a>
<span class="sourceLineNo">196</span>// Shift<a name="line.196"></a>
<span class="sourceLineNo">197</span><a name="line.197"></a>
<span class="sourceLineNo">198</span>    LSHIFT(2, "&lt;&lt;") {<a name="line.198"></a>
<span class="sourceLineNo">199</span>        @Override<a name="line.199"></a>
<span class="sourceLineNo">200</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.200"></a>
<span class="sourceLineNo">201</span>            return lhs.lshift(session, rhs);<a name="line.201"></a>
<span class="sourceLineNo">202</span>        }<a name="line.202"></a>
<span class="sourceLineNo">203</span>    },<a name="line.203"></a>
<span class="sourceLineNo">204</span><a name="line.204"></a>
<span class="sourceLineNo">205</span>    RSHIFT(2, "&gt;&gt;") {<a name="line.205"></a>
<span class="sourceLineNo">206</span>        @Override<a name="line.206"></a>
<span class="sourceLineNo">207</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.207"></a>
<span class="sourceLineNo">208</span>            return lhs.rshift(session, rhs);<a name="line.208"></a>
<span class="sourceLineNo">209</span>        }<a name="line.209"></a>
<span class="sourceLineNo">210</span>    },<a name="line.210"></a>
<span class="sourceLineNo">211</span><a name="line.211"></a>
<span class="sourceLineNo">212</span>    URSHIFT(2, "&gt;&gt;&gt;") {<a name="line.212"></a>
<span class="sourceLineNo">213</span>        @Override<a name="line.213"></a>
<span class="sourceLineNo">214</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.214"></a>
<span class="sourceLineNo">215</span>            return lhs.urshift(session, rhs);<a name="line.215"></a>
<span class="sourceLineNo">216</span>        }<a name="line.216"></a>
<span class="sourceLineNo">217</span>    },<a name="line.217"></a>
<span class="sourceLineNo">218</span><a name="line.218"></a>
<span class="sourceLineNo">219</span>// Relational<a name="line.219"></a>
<span class="sourceLineNo">220</span><a name="line.220"></a>
<span class="sourceLineNo">221</span>    LT(2, "&lt;") {<a name="line.221"></a>
<span class="sourceLineNo">222</span>        @Override<a name="line.222"></a>
<span class="sourceLineNo">223</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.223"></a>
<span class="sourceLineNo">224</span>            return lhs.compare(session, rhs, Value.LT);<a name="line.224"></a>
<span class="sourceLineNo">225</span>        }<a name="line.225"></a>
<span class="sourceLineNo">226</span>    },<a name="line.226"></a>
<span class="sourceLineNo">227</span><a name="line.227"></a>
<span class="sourceLineNo">228</span>    GT(2, "&gt;") {<a name="line.228"></a>
<span class="sourceLineNo">229</span>        @Override<a name="line.229"></a>
<span class="sourceLineNo">230</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.230"></a>
<span class="sourceLineNo">231</span>            return lhs.compare(session, rhs, Value.GT);<a name="line.231"></a>
<span class="sourceLineNo">232</span>        }<a name="line.232"></a>
<span class="sourceLineNo">233</span>    },<a name="line.233"></a>
<span class="sourceLineNo">234</span><a name="line.234"></a>
<span class="sourceLineNo">235</span>    LTEQ(2, "&lt;=") {<a name="line.235"></a>
<span class="sourceLineNo">236</span>        @Override<a name="line.236"></a>
<span class="sourceLineNo">237</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.237"></a>
<span class="sourceLineNo">238</span>            return lhs.compare(session, rhs, Value.LT | Value.EQ);<a name="line.238"></a>
<span class="sourceLineNo">239</span>        }<a name="line.239"></a>
<span class="sourceLineNo">240</span>    },<a name="line.240"></a>
<span class="sourceLineNo">241</span><a name="line.241"></a>
<span class="sourceLineNo">242</span>    GTEQ(2, "&gt;=") {<a name="line.242"></a>
<span class="sourceLineNo">243</span>        @Override<a name="line.243"></a>
<span class="sourceLineNo">244</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.244"></a>
<span class="sourceLineNo">245</span>            return lhs.compare(session, rhs, Value.GT | Value.EQ);<a name="line.245"></a>
<span class="sourceLineNo">246</span>        }<a name="line.246"></a>
<span class="sourceLineNo">247</span>    },<a name="line.247"></a>
<span class="sourceLineNo">248</span><a name="line.248"></a>
<span class="sourceLineNo">249</span>    INSTANCEOF(2, "instanceof") {<a name="line.249"></a>
<span class="sourceLineNo">250</span>        // Handled by InstanceofParser<a name="line.250"></a>
<span class="sourceLineNo">251</span>    },<a name="line.251"></a>
<span class="sourceLineNo">252</span><a name="line.252"></a>
<span class="sourceLineNo">253</span>// Equality<a name="line.253"></a>
<span class="sourceLineNo">254</span><a name="line.254"></a>
<span class="sourceLineNo">255</span>    EQUAL(2, "==") {<a name="line.255"></a>
<span class="sourceLineNo">256</span>        @Override<a name="line.256"></a>
<span class="sourceLineNo">257</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.257"></a>
<span class="sourceLineNo">258</span>            final Object lval = lhs.get(session);<a name="line.258"></a>
<span class="sourceLineNo">259</span>            final Object rval = rhs.get(session);<a name="line.259"></a>
<span class="sourceLineNo">260</span>            if (lval == null || rval == null)<a name="line.260"></a>
<span class="sourceLineNo">261</span>                return new ConstValue(lval == rval);<a name="line.261"></a>
<span class="sourceLineNo">262</span>            if (lval instanceof Boolean &amp;&amp; rval instanceof Boolean)<a name="line.262"></a>
<span class="sourceLineNo">263</span>                return new ConstValue((Boolean)lval == (Boolean)rval);<a name="line.263"></a>
<span class="sourceLineNo">264</span>            if (lval instanceof Character &amp;&amp; rval instanceof Character)<a name="line.264"></a>
<span class="sourceLineNo">265</span>                return new ConstValue((Character)lval == (Character)rval);<a name="line.265"></a>
<span class="sourceLineNo">266</span>            if (lval instanceof Number || rval instanceof Number)<a name="line.266"></a>
<span class="sourceLineNo">267</span>                return lhs.compare(session, rhs, Value.EQ);<a name="line.267"></a>
<span class="sourceLineNo">268</span>            return new ConstValue(lval.equals(rval));<a name="line.268"></a>
<span class="sourceLineNo">269</span>        }<a name="line.269"></a>
<span class="sourceLineNo">270</span>    },<a name="line.270"></a>
<span class="sourceLineNo">271</span><a name="line.271"></a>
<span class="sourceLineNo">272</span>    NOT_EQUAL(2, "!=") {<a name="line.272"></a>
<span class="sourceLineNo">273</span>        @Override<a name="line.273"></a>
<span class="sourceLineNo">274</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.274"></a>
<span class="sourceLineNo">275</span>            return new ConstValue(!(Boolean)Op.EQUAL.apply(session, lhs, rhs).get(session));<a name="line.275"></a>
<span class="sourceLineNo">276</span>        }<a name="line.276"></a>
<span class="sourceLineNo">277</span>    },<a name="line.277"></a>
<span class="sourceLineNo">278</span><a name="line.278"></a>
<span class="sourceLineNo">279</span>// Bitwise<a name="line.279"></a>
<span class="sourceLineNo">280</span><a name="line.280"></a>
<span class="sourceLineNo">281</span>    AND(2, "&amp;") {<a name="line.281"></a>
<span class="sourceLineNo">282</span>        @Override<a name="line.282"></a>
<span class="sourceLineNo">283</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.283"></a>
<span class="sourceLineNo">284</span>            return lhs.and(session, rhs);<a name="line.284"></a>
<span class="sourceLineNo">285</span>        }<a name="line.285"></a>
<span class="sourceLineNo">286</span>    },<a name="line.286"></a>
<span class="sourceLineNo">287</span><a name="line.287"></a>
<span class="sourceLineNo">288</span>    OR(2, "|") {<a name="line.288"></a>
<span class="sourceLineNo">289</span>        @Override<a name="line.289"></a>
<span class="sourceLineNo">290</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.290"></a>
<span class="sourceLineNo">291</span>            return lhs.or(session, rhs);<a name="line.291"></a>
<span class="sourceLineNo">292</span>        }<a name="line.292"></a>
<span class="sourceLineNo">293</span>    },<a name="line.293"></a>
<span class="sourceLineNo">294</span><a name="line.294"></a>
<span class="sourceLineNo">295</span>    XOR(2, "^") {<a name="line.295"></a>
<span class="sourceLineNo">296</span>        @Override<a name="line.296"></a>
<span class="sourceLineNo">297</span>        Value apply(ParseSession session, Value lhs, Value rhs) {<a name="line.297"></a>
<span class="sourceLineNo">298</span>            return lhs.xor(session, rhs);<a name="line.298"></a>
<span class="sourceLineNo">299</span>        }<a name="line.299"></a>
<span class="sourceLineNo">300</span>    },<a name="line.300"></a>
<span class="sourceLineNo">301</span><a name="line.301"></a>
<span class="sourceLineNo">302</span>// Logical<a name="line.302"></a>
<span class="sourceLineNo">303</span><a name="line.303"></a>
<span class="sourceLineNo">304</span>    LOGICAL_AND(2, "&amp;&amp;"),<a name="line.304"></a>
<span class="sourceLineNo">305</span>    LOGICAL_OR(2, "||"),<a name="line.305"></a>
<span class="sourceLineNo">306</span><a name="line.306"></a>
<span class="sourceLineNo">307</span>// Conditional<a name="line.307"></a>
<span class="sourceLineNo">308</span><a name="line.308"></a>
<span class="sourceLineNo">309</span>    CONDITIONAL(3, "?:"),<a name="line.309"></a>
<span class="sourceLineNo">310</span><a name="line.310"></a>
<span class="sourceLineNo">311</span>// Assignment<a name="line.311"></a>
<span class="sourceLineNo">312</span><a name="line.312"></a>
<span class="sourceLineNo">313</span>    EQUALS(2, "="),<a name="line.313"></a>
<span class="sourceLineNo">314</span>    PLUS_EQUALS(2, "+="),<a name="line.314"></a>
<span class="sourceLineNo">315</span>    MINUS_EQUALS(2, "-="),<a name="line.315"></a>
<span class="sourceLineNo">316</span>    MULTIPLY_EQUALS(2, "*="),<a name="line.316"></a>
<span class="sourceLineNo">317</span>    DIVIDE_EQUALS(2, "/="),<a name="line.317"></a>
<span class="sourceLineNo">318</span>    MODULO_EQUALS(2, "%="),<a name="line.318"></a>
<span class="sourceLineNo">319</span>    AND_EQUALS(2, "&amp;="),<a name="line.319"></a>
<span class="sourceLineNo">320</span>    XOR_EQUALS(2, "^="),<a name="line.320"></a>
<span class="sourceLineNo">321</span>    OR_EQUALS(2, "|="),<a name="line.321"></a>
<span class="sourceLineNo">322</span>    LSHIFT_EQUALS(2, "&lt;&lt;="),<a name="line.322"></a>
<span class="sourceLineNo">323</span>    RSHIFT_EQUALS(2, "&gt;&gt;="),<a name="line.323"></a>
<span class="sourceLineNo">324</span>    URSHIFT_EQUALS(2, "&gt;&gt;&gt;=");<a name="line.324"></a>
<span class="sourceLineNo">325</span><a name="line.325"></a>
<span class="sourceLineNo">326</span>// Fields<a name="line.326"></a>
<span class="sourceLineNo">327</span><a name="line.327"></a>
<span class="sourceLineNo">328</span>    private final int arity;<a name="line.328"></a>
<span class="sourceLineNo">329</span>    private final String symbol;<a name="line.329"></a>
<span class="sourceLineNo">330</span><a name="line.330"></a>
<span class="sourceLineNo">331</span>// Constructors<a name="line.331"></a>
<span class="sourceLineNo">332</span><a name="line.332"></a>
<span class="sourceLineNo">333</span>    private Op(int arity, String symbol) {<a name="line.333"></a>
<span class="sourceLineNo">334</span>        this.arity = arity;<a name="line.334"></a>
<span class="sourceLineNo">335</span>        this.symbol = symbol;<a name="line.335"></a>
<span class="sourceLineNo">336</span>    }<a name="line.336"></a>
<span class="sourceLineNo">337</span><a name="line.337"></a>
<span class="sourceLineNo">338</span>// Methods<a name="line.338"></a>
<span class="sourceLineNo">339</span><a name="line.339"></a>
<span class="sourceLineNo">340</span>    /**<a name="line.340"></a>
<span class="sourceLineNo">341</span>     * Get the arity of this symbol.<a name="line.341"></a>
<span class="sourceLineNo">342</span>     *<a name="line.342"></a>
<span class="sourceLineNo">343</span>     * @return symbol arity<a name="line.343"></a>
<span class="sourceLineNo">344</span>     */<a name="line.344"></a>
<span class="sourceLineNo">345</span>    public int getArity() {<a name="line.345"></a>
<span class="sourceLineNo">346</span>        return this.arity;<a name="line.346"></a>
<span class="sourceLineNo">347</span>    }<a name="line.347"></a>
<span class="sourceLineNo">348</span><a name="line.348"></a>
<span class="sourceLineNo">349</span>    /**<a name="line.349"></a>
<span class="sourceLineNo">350</span>     * Get the symbol associated with this operator.<a name="line.350"></a>
<span class="sourceLineNo">351</span>     *<a name="line.351"></a>
<span class="sourceLineNo">352</span>     * @return operator symbol<a name="line.352"></a>
<span class="sourceLineNo">353</span>     */<a name="line.353"></a>
<span class="sourceLineNo">354</span>    public String getSymbol() {<a name="line.354"></a>
<span class="sourceLineNo">355</span>        return this.symbol;<a name="line.355"></a>
<span class="sourceLineNo">356</span>    }<a name="line.356"></a>
<span class="sourceLineNo">357</span><a name="line.357"></a>
<span class="sourceLineNo">358</span>    /**<a name="line.358"></a>
<span class="sourceLineNo">359</span>     * Apply this operator to the given parameters.<a name="line.359"></a>
<span class="sourceLineNo">360</span>     *<a name="line.360"></a>
<span class="sourceLineNo">361</span>     * @param session current session<a name="line.361"></a>
<span class="sourceLineNo">362</span>     * @param args operator arguments<a name="line.362"></a>
<span class="sourceLineNo">363</span>     * @return result of operation<a name="line.363"></a>
<span class="sourceLineNo">364</span>     * @throws IllegalArgumentException if {@code args} contains inappropriate value(s)<a name="line.364"></a>
<span class="sourceLineNo">365</span>     * @throws IllegalArgumentException if the length of {@code args} does not match this operator<a name="line.365"></a>
<span class="sourceLineNo">366</span>     */<a name="line.366"></a>
<span class="sourceLineNo">367</span>    public Value apply(ParseSession session, Value... args) {<a name="line.367"></a>
<span class="sourceLineNo">368</span>        if (args.length != this.arity)<a name="line.368"></a>
<span class="sourceLineNo">369</span>            throw new EvalException("wrong number of arguments " + args.length + " != " + this.arity + " given to " + this);<a name="line.369"></a>
<span class="sourceLineNo">370</span>        switch (args.length) {<a name="line.370"></a>
<span class="sourceLineNo">371</span>        case 1:<a name="line.371"></a>
<span class="sourceLineNo">372</span>            return this.apply(session, args[0]);<a name="line.372"></a>
<span class="sourceLineNo">373</span>        case 2:<a name="line.373"></a>
<span class="sourceLineNo">374</span>            return this.apply(session, args[0], args[1]);<a name="line.374"></a>
<span class="sourceLineNo">375</span>        case 3:<a name="line.375"></a>
<span class="sourceLineNo">376</span>            return this.apply(session, args[0], args[1], args[2]);<a name="line.376"></a>
<span class="sourceLineNo">377</span>        default:<a name="line.377"></a>
<span class="sourceLineNo">378</span>            throw new RuntimeException("internal error");<a name="line.378"></a>
<span class="sourceLineNo">379</span>        }<a name="line.379"></a>
<span class="sourceLineNo">380</span>    }<a name="line.380"></a>
<span class="sourceLineNo">381</span><a name="line.381"></a>
<span class="sourceLineNo">382</span>    /**<a name="line.382"></a>
<span class="sourceLineNo">383</span>     * Get the {@link Op} corresponding to the given symbol.<a name="line.383"></a>
<span class="sourceLineNo">384</span>     * Note: some symbols correspond to multiple {@link Op}s:<a name="line.384"></a>
<span class="sourceLineNo">385</span>     * &lt;ul&gt;<a name="line.385"></a>
<span class="sourceLineNo">386</span>     *  &lt;li&gt;For {@code +} or {@code -}, the binary operator is returned&lt;/li&gt;<a name="line.386"></a>
<span class="sourceLineNo">387</span>     *  &lt;li&gt;For {@code ++} or {@code --}, the post-increment operator is returned&lt;/li&gt;<a name="line.387"></a>
<span class="sourceLineNo">388</span>     * &lt;/ul&gt;<a name="line.388"></a>
<span class="sourceLineNo">389</span>     *<a name="line.389"></a>
<span class="sourceLineNo">390</span>     * @param symbol symbol<a name="line.390"></a>
<span class="sourceLineNo">391</span>     * @return corresponding operator<a name="line.391"></a>
<span class="sourceLineNo">392</span>     * @throws IllegalArgumentException if no such {@link Op} exists<a name="line.392"></a>
<span class="sourceLineNo">393</span>     */<a name="line.393"></a>
<span class="sourceLineNo">394</span>    public static Op forSymbol(String symbol) {<a name="line.394"></a>
<span class="sourceLineNo">395</span>        switch (symbol) {<a name="line.395"></a>
<span class="sourceLineNo">396</span>        case "+":<a name="line.396"></a>
<span class="sourceLineNo">397</span>            return Op.PLUS;<a name="line.397"></a>
<span class="sourceLineNo">398</span>        case "-":<a name="line.398"></a>
<span class="sourceLineNo">399</span>            return Op.MINUS;<a name="line.399"></a>
<span class="sourceLineNo">400</span>        case "++":<a name="line.400"></a>
<span class="sourceLineNo">401</span>            return Op.POST_INCREMENT;<a name="line.401"></a>
<span class="sourceLineNo">402</span>        case "--":<a name="line.402"></a>
<span class="sourceLineNo">403</span>            return Op.POST_DECREMENT;<a name="line.403"></a>
<span class="sourceLineNo">404</span>        default:<a name="line.404"></a>
<span class="sourceLineNo">405</span>            for (Op op : Op.values()) {<a name="line.405"></a>
<span class="sourceLineNo">406</span>                if (op.symbol.equals(symbol))<a name="line.406"></a>
<span class="sourceLineNo">407</span>                    return op;<a name="line.407"></a>
<span class="sourceLineNo">408</span>            }<a name="line.408"></a>
<span class="sourceLineNo">409</span>            throw new IllegalArgumentException("no operation with symbol `" + symbol + "' exists");<a name="line.409"></a>
<span class="sourceLineNo">410</span>        }<a name="line.410"></a>
<span class="sourceLineNo">411</span>    }<a name="line.411"></a>
<span class="sourceLineNo">412</span><a name="line.412"></a>
<span class="sourceLineNo">413</span>    Value apply(ParseSession session, Value arg) {<a name="line.413"></a>
<span class="sourceLineNo">414</span>        throw new UnsupportedOperationException();<a name="line.414"></a>
<span class="sourceLineNo">415</span>    }<a name="line.415"></a>
<span class="sourceLineNo">416</span><a name="line.416"></a>
<span class="sourceLineNo">417</span>    Value apply(ParseSession session, Value arg1, Value arg2) {<a name="line.417"></a>
<span class="sourceLineNo">418</span>        throw new UnsupportedOperationException();<a name="line.418"></a>
<span class="sourceLineNo">419</span>    }<a name="line.419"></a>
<span class="sourceLineNo">420</span><a name="line.420"></a>
<span class="sourceLineNo">421</span>    Value apply(ParseSession session, Value arg1, Value arg2, Value arg3) {<a name="line.421"></a>
<span class="sourceLineNo">422</span>        throw new UnsupportedOperationException();<a name="line.422"></a>
<span class="sourceLineNo">423</span>    }<a name="line.423"></a>
<span class="sourceLineNo">424</span>}<a name="line.424"></a>
<span class="sourceLineNo">425</span><a name="line.425"></a>




























































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